5 Things Every Homeowner Should Know Before Submitting a Planning Application

Published 31 March 2026

We have analysed over half a million planning applications across the UK. Here are the five most important things the data reveals that every homeowner should know before submitting a planning application. Getting these right does not guarantee approval, but getting them wrong almost guarantees problems.

1. Check If You Even Need Planning Permission

This sounds obvious, but a surprising number of applications are submitted for projects that did not actually need permission. Permitted development rights allow many common home improvements without a planning application, provided you stay within the specified limits.

Single-storey rear extensions up to 6 metres from the original rear wall (8 metres for detached houses, under the prior approval process) are often permitted development. Loft conversions that add up to 40 cubic metres of space (50 for detached houses) and do not extend beyond the existing roof plane at the front typically do not need permission. Most garden structures under 2.5 metres to the eaves, located more than 2 metres from any boundary, are permitted. Fences and walls up to 2 metres (1 metre adjacent to a highway) are allowed without application.

However, permitted development rights are restricted or removed entirely in several situations:

• Conservation areas - side extensions, cladding, satellite dishes on front elevations, and some rear extensions all lose their permitted development status
• Listed buildings - no permitted development rights for any works that affect the character of the building
• Flats and maisonettes - have almost no permitted development rights for external alterations
• Article 4 directions - councils can remove specific permitted development rights from specific areas
• Previous extensions - permitted development allowances are cumulative, so previous extensions (even ones built by previous owners) count against your limits

If you are unsure, apply for a Lawful Development Certificate (LDC). For around 130 pounds, the council will confirm in writing whether your proposed work is permitted development. This gives you legal certainty and is useful evidence if the property is ever sold.

2. Look at What Has Been Approved Nearby

Planning decisions are not made in isolation. Officers look at precedent, both the formal legal precedent set by appeal decisions and the informal local precedent of what has been approved in your street and neighbourhood. This works both for and against you.

If your neighbour got approval for a two-storey rear extension last year, your chances of getting the same are significantly higher. The council would need a good reason to refuse something essentially identical to what they approved next door. Conversely, if a similar scheme was refused two doors down and the refusal was upheld on appeal, you face an uphill battle to convince the council that your proposal is materially different.

This is not just about size and scale. It extends to materials, roof styles, window proportions, and design approach. If every extension on your street uses matching brick and pitched roofs, a flat-roofed render extension will face more resistance, not because flat roofs are inherently bad, but because "out of character with the area" is a legitimate refusal reason.

Practical tip: before you brief your architect, spend an hour on your council's planning portal looking at approved applications within 200 metres of your site. Note what was approved, what was refused, and why. This intelligence is free and publicly available. Planning Signal makes this even easier by showing you recent decisions plotted on a map.

3. Pre-Application Advice Is Worth the Money

Most councils offer a formal pre-application advice service. You submit an outline of your proposals (often just sketches at this stage, not full drawings) and a planning officer gives you their professional opinion on whether it is likely to be approved, what changes would improve your chances, and what supporting documents you will need.

The fees vary widely by council and by project scale: from around 50 pounds for a written response on a simple householder scheme, up to 500 pounds or more for a meeting with an officer about a larger project. But consider what you are getting: a planning professional telling you, before you spend thousands on architectural drawings, whether your idea has legs.

In our data, councils with strong pre-application services tend to have higher overall approval rates. This is not a coincidence. When officers flag problems early, applicants adjust their schemes before submitting. The hopeless applications never enter the system. The borderline ones get improved. The result is fewer refusals, less wasted money, and faster decisions.

Pre-application advice is not binding. An officer might say your scheme looks acceptable and a different officer might later refuse it (though this is rare and you would have strong grounds for complaint). But it gives you a baseline of confidence and, crucially, a named contact at the council who has already engaged with your proposal.

4. Your Neighbours Matter More Than You Think

Planning officers are trained professionals who assess applications against adopted policy. Neighbour objections do not have a veto. A hundred letters of objection will not defeat an application that complies with policy, and zero objections will not save one that does not.

But that is the theory. In practice, neighbour objections trigger closer scrutiny. An officer who might have delegated a straightforward approval will look more carefully at a case that has generated complaints. If the application is borderline, objections can tip the balance. And if enough objections are received, the application may be called to planning committee (elected councillors) rather than decided by an officer under delegated authority. Committee decisions are less predictable than officer decisions.

The most common objection grounds that carry planning weight are:

• Loss of light - will the development significantly reduce daylight or sunlight to neighbouring windows or gardens?
• Overlooking and loss of privacy - do new windows look directly into neighbouring rooms or private garden areas?
• Overbearing impact - does the development create an oppressive sense of enclosure for neighbours?
• Parking and traffic - will the development generate traffic or remove parking that causes highway safety issues?
• Out of character - is the development so different in scale, design, or materials that it harms the character of the area?

Objections about loss of property value, loss of a view, construction disruption, boundary disputes, or personal matters carry no planning weight and will be disregarded by officers. But even these "non-material" objections signal unhappy neighbours who might escalate their complaints to councillors.

The practical lesson: talk to your neighbours before you submit. Show them the plans. Explain what you are doing and why. Address their concerns where you can (moving a window, adding screening, choosing lower-impact materials). A conversation over the fence can prevent a formal objection letter to the council. And if objections do come in, an officer who can see that you already attempted to address concerns will look more favourably on your application.

5. A Good Application Is a Complete Application

The single biggest cause of delays in the planning system is incomplete applications. When an application arrives at the council, it goes through a validation check before it is even registered. If anything is missing, the whole package is returned to you. The statutory clock does not start until the application is valid, so an incomplete submission can add weeks to your timeline before a planning officer even looks at it.

Every householder application must include:

• Completed application form - including all ownership certificates (Certificate A if you own the whole site, Certificate B if someone else owns part of it)
• Location plan - at 1:1250 or 1:2500 scale, with the application site edged in red and any other land owned by you edged in blue
• Block plan - at 1:500 or 1:200 scale, showing the proposed development in relation to site boundaries and neighbouring properties
• Existing and proposed floor plans - typically at 1:50 or 1:100
• Existing and proposed elevations - all affected elevations, at the same scale
• The correct fee - currently 258 pounds for householder applications in England

Depending on your location and proposal, you may also need:

• Design and access statement - required for applications in conservation areas and for major development
• Heritage statement - if the site is within the setting of a listed building or in a conservation area
• Tree survey - if there are trees on or adjacent to the site that could be affected
• Flood risk assessment - if any part of the site is in Flood Zone 2 or 3
• Ecology report - if there is potential for protected species (bats in roof voids are particularly common)
• Contamination assessment - if the site has a history of potentially contaminative use

Check your council's validation checklist before you submit. Every council publishes one, and it tells you exactly what documents are required for your type of application in your area. Missing a single item from this list means your application bounces back.

Bonus: Timing Matters

Planning application volumes spike in January and February (New Year resolution to build that extension) and again in early autumn. They dip over summer holidays and around Christmas. If you can submit during a quieter month, your application may reach an officer's desk faster simply because there is less competition for their time.

Similarly, avoid submitting just before the August holiday period. An application registered on 1 August may sit in a queue for two to three weeks while officers are on annual leave, eating into your eight-week determination period without any actual progress.

Ready to get started? Read our step-by-step guide to applying for planning permission, or search your postcode on Planning Signal to see what has been decided near you.